计算了优树的选择差和遗传增益。
Selection differential and genetic gains are also estimated.
疏伐越是严格，就越可能有较大的遗传增益。
The more rigorous the thinning, the greater the possible genetic gain.
在美国的一些林木育种项目中，育种群已用来控制种子园的近交、捕获最大的遗传增益的有效措施。
Breeding groups are being used to control inbreeding in a breeding population and to effectively achieve maximum genetic gains in some tree improvement programs of the United States.
利用设置在福建省武平县的马尾松遗传增益测定林材料，以验证优良种源、母树林及种子园混系的现实遗传增益。
The genetic gain test plantations of masson pine located in Wuping of Fujian (China) were used to certificate realized genetic gain of superior provenances, seed stands and clonal seed orchards.
我们过去都是靠种籽来培育新一代的种苗，但世界银行建议采取无性系种苗扦插技术，这样产生的种苗遗传增益高多了。
We used to rely on seeds to grow the next generation of trees but the World Bank proposed the use of cloning seedlings. This led to a much higher yield.
通过子代测定选出的优良家系，其有性后代在树高、胸径和材积早期生长的遗传增益分别为8.24%，14.33%和24.16%。
The genetic gains of superior families selected by progeny tests on early tree height, diameter breast-high and volume growth were 8.24%, 14.33% and 24.16% respectively.
根据胸径、树高和材积进行优良家系的初步选择，选择前50个优良家系所获得的遗传增益分别为17.8%、18.6%和18.7%。
The genetic gains of 17.8%, 18.6% and 18.7% would be got when 50 plus families were primarily selected based on DBH, height and volume respectively.
在遗传操作过程中，改进了编码方法，构造的适应度函数不但以一定的零陷深度为目标，还考虑副瓣的增益维持在一定的水平。
In the process of genetic manipulation, encoding method is improved, fitness function is constructed not only considering nulling depth, but also the side lobe gain to maintain a certain level.
在遗传操作过程中，改进了编码方法，构造的适应度函数不但以一定的零陷深度为目标，还考虑副瓣的增益维持在一定的水平。
In the process of genetic manipulation, encoding method is improved, fitness function is constructed not only considering nulling depth, but also the side lobe gain to maintain a certain level.
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